Acne lesions heal slowly, and when one begins to resolve, others seem to crop up.

痤疮病损愈合缓慢，而且一个痤疮刚有痊愈迹象，其他的又要冒头了。

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As the drug grew in popularity, stories began to crop up about people eating in their sleep.

随着这种安眠药的流行，发生了多起人们在睡觉时进食的事件。

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However, issues start to crop up as soon as we consider relaying operations from one client to the other.

然而，当我们考虑客户端之间操作转发时候问题开始暴露出来了。

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Experts say the new methods also increase crop production up to five times more than crops that depend on rainfall only.

VOA: special.2010.02.08

The crop may not be ready for up to two years.

VOA: special.2009.07.07

We've never been able to get that substantiated, but it does crop up in some of the commentaries.

VOA: standard.2010.08.11

Chess continues to crop up in books and movies as a metaphor for life.

FORBES: Magazine Article

This year, exterior paint and live plants are just as likely to crop up among popular merchandise.

WSJ: Mild Winter Could Help Home Depot Earnings

For the time being, such materials tend to crop up mainly in sports uniforms and other such gear.

ECONOMIST: The changing fabric of Italian fashion | The